Why doesn the skin tan equally on all parts?
A. The insides of the arms and legs do not tan so well because they have less pigment forming cells than the rest of the skin. The face does not tan as easily because it has a thicker horny layer by nature, as a protection against UV-B rays. Freckles and pigmental spots have a high number of tanning pigments, and for this reason will turn darker much faster than other parts of the skin. Parts of the skin that we lay on have a poor circulation. A lack of oxygen may lead to a reduced coloration of the melanin pigments. Tanning without pressure spots is thus provided best by sunbeds with ergonomically designed shaped base acrylics.
