Thanks for the second picture.

The Keratosis pilaris is a sign of fatty acid deficiency.
So I'd do the good fats every day. People with very low omega-3 status typically develop these bumps. They will go away with proper nutrition.

My thread that explains them:
http://neurotalk.psychcentral.com/thread6092.html

I see the area you are trying to communicate, but the picture is tough. It could be an area of pigmentation...called cafe au lait spots, which are hereditary, and or may occur follow sun exposure to damaged skin.
http://en.wikipedia.org/wiki/Caf%C3%A9_au_lait_spot
Don't be alarmed by the big words, they are very very common.
I have some and so does my son. My dad had neurofibramotosis, but neither my son or I do. You have to have many before a disease is linked to them.

Here is another medical reference:
http://www.emedicine.com/ped/TOPIC2754.HTM

Once a cafe au lait spot appears it does not go away. The pigment stays. Sometimes they are small freckles bunched up together, other times flat and either large or small.

If this skin discoloration bothers you, a trip to the dermatologist would be best. Doctors vary in their skill in identifying skin things.

If you develop bruise type lesions along your shins, then that could be serious, and needs immediate attention.
erythema nodosum:
http://www.medicinenet.com/erythema_nodosum/article.htm

This is what I expected from your first post.