<unk>  <unk>  is most common on the face, but it can also happen on other parts of the body where hair is shaved or plucked, especially areas where hair is curly and the skin is sensitive, such as genital shaving (more properly termed<unk>  pubis or PFP). After a hair has been shaved, it begins to grow back. Curly hair tends to curl into the skin instead of straight out of the follicle, leading to an inflammation reaction.<unk>  can make the skin look itchy and red, and in some cases, it can even look like pimples. These inflamed papules or pustules can form especially if the area becomes infected. This is especially a problem for some men who have naturally coarse or tightly curling thick hair. Curly hair increases the likelihood of<unk>  by a factor of 50. If left untreated over time, this can cause keloid scarring in the beard area.<unk>  can further be divided into two types of ingrown hairs: transfollicular and extrafollicular. The extrafollicular hair is a hair that has exited the follicle and reentered the skin. The transfollicular hair never exits the follicle, but because of its naturally curly nature curls back into the follicle causing fluid build-up and irritation. A common polymorphism in a keratin gene (K6hf) has been linked to<unk> , suggesting that it may be a genetic risk factor. This sequence change leads to an amino acid substitution in the highly conserved helix initiation motif of the K6hf rod domain. Carriers of the A12T polymorphism are six times more likely to develop<unk>  compared with people homozygous for the wild-type K6hf sequence. This suggests K6hf mutation structurally weakens the companion layer separating the inner and outer root sheath and increases the chances that a beard hair will in-grow.
Pseudofolliculitis barbae
Folliculitis nares perforans
Tinea imbricata
Ichthyosis bullosa of Siemens
Neutrophilic eccrine hidradenitis
Steatocystoma simplex
Trichostasis spinulosa
Lichen myxedematosus