I would be pleased to answer your question .
From your description of the lesions it looks like you have an Ulcer . If the skin is eaten up , it means an ulcer might be present . It would be important to get it checked from your Dermatologist
or the Physician to rule out an STD
or even Cancer .
It would be important to get certain tests done and also to rule out some pathological conditions which can be treated at an early stage before complications set in .
It can be a viral or bacterial infection . Anti fungal creams will not help to stop this condition .
Please meet the doctor as early as possible .
Thanks and Take care