Light skin of UVA can penetrate deeply into the dermis in persons with light skin pigmentation with little protective melanin pigment. The characteristic of fair skin, red hair, and freckling is associated with high amount of pheomelanin, little amounts of eumelanin. This phenotype is caused by a loss-of-function mutation in the melanocortin 1 receptor (MC1R) gene. However, variations in the MC1R gene sequence only have considerable influence on pigmentation in populations where red hair and extremely fair skin is prevalent. The gene variation’s primary effect is to promote eumelanin synthesis at the expense of pheomelanin synthesis, although this contributes to very little
Baumann Skin Types keep allergens and irritants out. Sensitive skin often reacts to skincare products with redness, stinging, burning or acne, while resistant skin rarely experiences negative side effects. The strong stratum corneum associated with resistant skin can make the skin resistant to the beneficial effects of skincare ingredients due to less absorption. There are 4 unique subtypes of sensitive skin, and they are all different, all sensitive subtypes have inflammation in common. This skin attribute is measured by the skin’s tendency to develop unwanted pigment. This can be sun-induced, as in melasma, solar lentigos and freckles, or due to injury in the