Hello,
Other than wearing full sleeved clothes, you should keep your body as much covered with light clothes as possible. Without treatment, these scars usually takes about 6 months to resolve and for the skin color to go back to its normal color. Topical treatments with acids and chemical peels can be effective but can take a while for the skin to totally revert to its normal color. Microdermabrasion can also be done, but this might require several sessions. Skin resurfacing using lasers is also an option.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
you may want to go to our "Ask an Expert" forum. Unfortunately I have no experience with spider bites and how to treat the scars from them.
Sincerly,
Cindie (Martikadragoon)
CL Dermatology