There isn't sufficient information to give you a specific diagnosis. I would advise you to meet a general surgeon so that you can be examined and undergo investigations such as CBC, X-Ray, etc to find the underlying cause and have it treated accordingly.If the problem persists or worsens visit the general surgeon at the earliest

Greetings. There can be few medical conditions associated with such presentation and should be ruled out by meeting a Dermatologist. The information provided is limited. A thorough history and clinical examination will be helpful. A photograph will add in obtaining better recommendations