Dermatologists perform skin biopsies to test for skin cancer.  In some cases, rashes and acne may be a symptom of underlying skin conditions, and a dermatologist can diagnose and treat them.
assitant
Yes, they do treat rashes, too.
assistant
What does a dermatologist do?
user
Dermatologists diagnose and treat diseases and injuries of the skin, nails, and hair.
assistant
Do they treat rashes or acne?
user