Could this be dermatitis on my leg?

Hi,

These three raised marks have been there for a few months and they do not go away, except for the smaller one which appeared recently.

Could it be dermatitis?

Its located at the back of the leg where it joins my backside. Im 25yrs old and female.

Please diagnose and tell me how to remove it (i do not have access to a doctor at the moment.)

Thankyou