Skin Changes You Shouldn't Delay Consulting About
Collection Skin 2026.08.01

Skin Changes You Shouldn't Delay Consulting About

A checklist to distinguish changes and emergency signs without jumping to conclusions from just photos of moles, rashes, and wounds

It's hard to assess the risks of moles, rashes, and wounds based on just one photo. You need to consider how it has changed compared to its normal appearance, as well as any recurring bleeding and pain. An asymmetrical mole, where both sides differ in shape or the existing symmetry is broken, is a reason to consult a dermatologist. Diagnosis of benign or malignant nature cannot be determined from photos alone. Changes in asymmetry should be observed without rubbing the skin. If an asymmetrical mole also has worsening symptoms or changes quickly, prioritize consulting a medical institution over self-care. Skin conditions vary from person to person, so one method does not fit everyone.

ABCDE is not a diagnostic tool but a guideline to help notice changes and consider seeking medical attention. Meeting one criterion does not mean cancer, nor does it mean you can't express concerns if it doesn't apply. Observe whether the borders are becoming irregular—whether the edges are blurring or becoming jagged. Record them under the same conditions for comparison with their original shape. Changes in irregular borders should be observed without rubbing the skin. If irregular borders are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Keep records, but do not confirm illnesses based solely on photos and descriptions.

Rapidly spreading rashes and signs of infection, as well as mucosal involvement, may indicate a situation that cannot be delayed. If you experience difficulty breathing or swallowing, or facial swelling, seek emergency assistance immediately.

Asymmetrically Changing Spots

Asymmetrical moles, where both sides differ in shape or where existing symmetry is broken, are a reason to consult a dermatologist. Diagnosis of benign or malignant nature cannot be determined from photos alone. Asymmetrical moles should be observed without rubbing the skin. If an asymmetrical mole also has worsening symptoms or changes quickly, prioritize consulting a medical institution over self-care.

Irregular Edges

Observe whether the borders are becoming irregular—are the edges blurring or becoming jagged? Record them under the same conditions for the purpose of comparison with their original shape. Changes in irregular borders should be observed without rubbing the skin. If irregular borders are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Mixed Color Lesions

Lesions with multiple colors—such as brown, black, and red—should be considered for consultation if new colors mix or the distribution changes. The appearance may vary depending on skin tone. Lesions with multiple colors should be observed without rubbing the skin. If lesions with multiple colors are also accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Enlarging or Raised Changes

Growing or raised changes—if size and height change or the surrounding skin feels different, do not judge safety solely by diameter; report the change itself. Growing or raised changes should be observed without rubbing the skin. If growing or raised changes are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Continuously Changing Spots

Continuously changing moles in terms of shape, color, size, and sensation over time are important signals to observe. Note the timing and speed of changes to show to the dermatologist. Continuously changing moles should be observed without rubbing the skin. If continuously changing moles are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Lesions That Are Uniquely Different from Other Spots

Lesions that are distinctly different from other moles, which may be referred to as the ugly duckling sign, are a basis for considering professional examination. Lesions that are distinctly different should be observed without rubbing the skin. If distinctly different lesions are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Itchy or Repeatedly Bleeding Spots

It’s important to differentiate between a mole that is itchy or bleeding repeatedly due to being caught on clothing, and one that bleeds without cause. Persistent itching or pain also warrants consultation. Itchy or repeatedly bleeding moles should be observed without rubbing the skin. If itchy or repeatedly bleeding moles are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Non-Healing Wound

Wounds that do not heal—if they do not close after weeks or scabs repeatedly form and oozing occurs—should not be delayed; consider seeing a doctor instead of just applying ointment. Non-healing wounds should be observed without rubbing the skin. If non-healing wounds are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Non-healing wounds cannot be confirmed based on photos alone.

Wounds with Redness, Heat, and Pus

Wounds with redness, warmth, and pus—if the redness, pain, warmth, or pus around the wound increases, there may be a risk of infection. Do not squeeze or use leftover antibiotics arbitrarily. Wounds with redness, warmth, and pus should be observed without rubbing the skin. If wounds with redness, warmth, and pus are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care.

Blisters and Skin Shedding

Blisters and skin peeling—if there are large blisters, peeling, severe pain, or fever, prompt medical evaluation may be necessary. Blisters and peeling skin should be observed without rubbing the skin. If blisters and peeling skin are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Keeping a record of when the blisters and peeling started, as well as the products used, can make it easier to explain during consultations.

Rash Involving Mucous Membranes

Rashes involving mucosal surfaces—if rashes spread around the eyes, lips, mouth, or genitals, do not assume it’s just irritation from regular cosmetics; seek medical attention promptly. Rashes involving mucosal surfaces should be observed without rubbing the skin. If mucosal involvement rashes are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Rashes involving mucosal surfaces cannot be confirmed based on photos alone.

Shortness of Breath and Facial Swelling

Difficulty breathing and facial swelling—if rashes are accompanied by difficulty breathing or swallowing, or if your eyes or lips swell, request emergency medical help immediately. Difficulty breathing and facial swelling should be observed without rubbing the skin. If difficulty breathing and facial swelling are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Difficulty breathing and facial swelling cannot be confirmed based on photos alone.

Rapidly spreading rashes and signs of infection, as well as mucosal involvement, may indicate a situation that cannot be delayed. If you experience difficulty breathing or swallowing, or facial swelling, seek emergency assistance immediately. Lesions with multiple colors—such as brown, black, and red—should be considered for consultation if new colors mix or the distribution changes. The appearance may vary depending on skin tone. Lesions with multiple colors should be observed without rubbing the skin. If lesions with multiple colors are also accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Skin conditions vary from person to person, so one method does not fit everyone.

ABCDE is not a diagnostic tool but a guideline to help notice changes and consider seeking medical attention. Meeting one criterion does not mean cancer, nor does it mean you can't express concerns if it doesn't apply. With growing or raised changes, if size and height change or the surrounding skin feels different, do not judge safety solely by diameter; report the change itself. Growing or raised changes should be observed without rubbing the skin. If growing or raised changes are accompanied by worsening symptoms or rapid changes, prioritize consulting a medical institution over self-care. Keep records, but do not confirm illnesses based solely on photos and descriptions.

It's hard to assess the risks of moles, rashes, and wounds based on just one photo. You need to consider how it has changed compared to its normal appearance, as well as any recurring bleeding and pain.

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