It is really difficult to diagnose skin conditions without looking at them. There may be a possibility that it is a wart as they have irregular patterns. Perphas if you could provide a picture, a better diagnosis could be provided. If it is a wart and is not causing any problems then it is best left untreated. Again a picture would really help. Also you could check out the dermatology atlas at the link mentioned below to compare your skin condition with the ones present. http://dermatlas.med.jhmi.edu/derm/. Try looking at pictures of warts. Otherwise browse through it and reply with an image which looks similar to your condition. The best thing would be to take a picture and post it.

After having re read your post I doubt it is a post becuase you are saying that it peels off. Warts do not peel of. Please do provide a picture because proper diagnosis of skin conditions depend on picture.