Ulcer is the breach of the continuity of skin, epithelium or mucous membrane caused by sloughing out of inflamed necrotic tissue.

Treatment ― OTC Drugs
Ulcers that persist for no reason may be skin cancer (squamous cell carcinoma).
Clean and dress the wound.
Initially, betadine works by releasing iodine, which leads to the death of various microorganisms. However, continued use of betadine may interfere with wound healing.
Apply antibiotic ointment daily and cover the wound with a hydrocolloid dressing to prevent further infection.

#Hydrocolloid dressing [Duoderm]
  • Aphthous ulcer
  • Ulcer with the thick crust
References Pressure Ulcer 31971747 
Pressure injuries, also termed bedsores, decubitus ulcers, or pressure ulcers, are localized skin and soft tissue injuries that form as a result of prolonged pressure and shear, usually exerted over bony prominences. These ulcers are present 70% of the time at the sacrum, ischial tuberosity, and greater trochanter. However, they can also occur in the occiput, scapula, elbow, heel, lateral malleolus, shoulder, and ear.