How much should i worry about skin ulcers?

Depends: It depends on the type, number, location and etiology of skin ulcers. If you have to ask, you should seek care.

A lot: Skin ulcers if left untreated can lead to infection, loss of muscle, and even deep infection of the underlying bone. Ulcers are usually a symptom of an underlying medical condition that may require treatment such as diabetes and peripheral vascular disease. They may also be present in people with diminished sensation, poor mobility, or poor nutrition.