Question

which of the following is a potential sign of skin cancer that should be checked by a dermatologist as soon as possible?
any changes in a mole or birthmark
any red rash following sun exposure
a bad sunburn that makes skin peel
an unexplained bruise on the skin

Explanation:

Red rashes from sun exposure, peeling sunburns, and unexplained bruises are typically temporary, non-cancerous skin issues related to irritation, UV damage, or minor trauma. In contrast, changes in a mole or birthmark (such as size, shape, color, or texture changes) are key warning signs of potential skin cancer, requiring prompt dermatological evaluation.

Answer:

any changes in a mole or birthmark