Skin ulcers appear as open sores or craters with crusty skin surrounding the area. These sores are usually symptoms of conditions like:
Impetigo. This is a highly contagious bacterial skin infection that usually affects babies or younger children. Impetigo sores can be very red and itchy, and may ooze liquid which dries into a yellow crust around the sore. As a general rule, these sores appear on the arms or legs, or around the nose or mouth area.
Cold Sores. Fever blisters or cold sores are caused by the herpes simplex virus (HSV). Cold sores usually appear as blisters or open sores around the mouth area. It is also very contagious, though symptoms may not show up immediately after infection.
Thick, crusty, and scaly skin
Dry skin is a common skin irregularity that is typically accompanied by crusty or scaly skin that flakes off or peels. What are the most common skin problems with crusty, scaly skin?
Psoriasis. This is a chronic skin condition that causes the skin to develop plaques. It stems from skin cells multiplying faster due to a malfunction of the immune system.
Dermatitis. This term describes a group of skin disorders that result from irritation of the skin. Types of dermatitis include eczema, seborrheic dermatitis, and contact dermatitis.