Causes of hair loss induced by scalp infections.

Fol­li­culi­tis

Fol­li­culi­tis is a term for inflam­ma­tion of hair fol­li­cles. It looks like acne with lit­tle rings of inflam­ma­tion sur­round­ing the open­ing of a hair fol­li­cle. In the early stages of a fol­li­culi­tis, the hair fiber may still be present, but as the fol­li­culi­tis pro­gresses the hair often falls out. There are non-infectious forms of fol­li­culi­tis, such as those caused by oils and greases applied to the skin that clog up the hair fol­li­cles, but fol­li­culi­tis is usu­ally due to a bac­te­r­ial infec­tion. Non­pre­scrip­tion top­i­cal antibi­otics such as bac­i­tracin, myc­i­tracin, or neomycin can be used to treat minor folliculitis

Piedra

Piedra (tri­chomy­co­sis nodu­laris) hap­pens when the hair fibers are infected by a fun­gus. The vis­i­ble indi­ca­tor of a piedra infec­tion is devel­op­ment of hard nod­ules on hair fibers. Indeed, “piedra” is Span­ish for stone. Piedra infec­tion may affect hairs of the scalp, body, and gen­i­tal areas. Usu­ally the infec­tion is rel­a­tively benign. In parts of Malaysia, the nod­ules of black piedra are con­sid­ered attrac­tive and tra­di­tion­ally women encour­aged its growth by sleep­ing with their hair buried in the soil. Treat­ment gen­er­ally involves shav­ing off affected areas. Anti-fungals such as keto­cona­zole or terbinafine are also used.

Demodex fol­licu­lo­rum

Demodex is a lit­tle worm-like crea­ture that likes to live on skin and in hair fol­li­cles. It feeds on dead skin and oils, so it par­tic­u­larly likes to live in hair fol­li­cles where there are lots of both.

Humans are born free of Demodex, but dur­ing child­hood, through con­tact with oth­ers, the skin can become infected with it. For the most part, we never know they are there. They are benign, if repul­sive, lit­tle crea­tures. The most com­mon prob­lem with Demodex is that they may cause irri­ta­tion, par­tic­u­larly in the eye­lashes. If you have itchy eye­lashes, Demodex may be the problem.