About a year ago i had mosquito bites. the marks are still there and have become a dark circle of about .5 cm and with light skin inside and dark centre again. recently i had a minor scratch on my feet which turned into a infection and i have a similar b

Plhyperpigmentation: You evidently have a skin type that makes extra melanin (coloring) in response to inflammation. It will fade with time, but you should avoid sun and see a dermatologist for other ideas.

Need more info: It's hard to diagnose skin problems without seeing them. Please make an appointments with your family physician and/or a dermatologist.

Those darn Skeeters.: You reaction to mosquito bites is more than likely part of what is known as "Skeeter Syndrome". He has an exaggerated response to a protein in the mosquito's saliva. I think the scratch incident is coincidental and not related to the bites.