Dermatology
The dermatologist is a doctor who specialises in conditions that affect your skin, hair, and nails. They are also experts at treating various types of wounds such as cuts or bug bites! The Dermatology specialists will treat anything from acne to eczema with the latest treatments available today. Join our Dermatology Space and find answers from verified Dermatologists!
JOIN
MEMBERS
44
QUESTIONS
26
DOCTORS
16
Different skin cancers present differently.  Some like melanoma may have ulcer and bleed on its own, even without scratching.  Basal cell carcinoma are usually smooth and pearly in appearance, usually do not bleed.

It is hard to determine without the benefit of seeing a picture of the red mark.  If in doubt, it is advisable to get your local GP to take a look. 
Dr. Leong C K