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What you are left with is called POST INFLAMMATORY HYPER-PIGMENTED SPOTS.we very often see them after chicken pox
and mosquito bite.Most probably the condition what you have over legs and arms is called PRURIGO SIMPLEX
.This is seen because of mosquito bite where in patient gets small dark spots over legs and arms.
I would like to ask you here that do you get itching over arms and legs.
If yes,then you should first use topical steroids
to reduce itching
along with oral anti histaminics tablets .
Once relieved ,you should take treatment of pigmented spots.
There are creams like hydroquinone(of varying strength ) which can be applied topically at night .Creams like tretinoin
and glycolic acid
creams can also be tried.If marks are superficial these cream would reduce them.
If this doesn't work then you should try lasers .There are specific lasers like Q-switched Nd:yag laser (1064nm) which works specifically on pigmented lesions .One requires multiple sessions of the same depending upon the depth of the pigment.
For chicken pox marks ,it depends what the problem is .There are two things which we see in chicken pox marks -one that the lesion is depressed and second that the lesions is darker than the normal skin color. For depressed lesions you should go for any fractional lasers which would reduce the depth of the lesion.And for pigmentation you can try again Q-switched Nd:yag laser .
Along with this you should always use a good spf sunscreen over exposed areas of body.
I hope I've answered your question,in case you have further question you can write back to us.