What does black piedra look like?
Black piedra is characterized by stone-hard black nodules, measuring 1 to 2 mm, that are tightly adherent to the hair shafts. This infection usually affects scalp hair, whereas both facial and pubic hairs are typically not affected. A single hair shaft may have one or multiple nodules scattered along its entire length.
How is black piedra diagnosed?
Black piedra results in the formation of firm nodules along the shaft of the hair. The diagnosis of piedra may be made easily by observation of hyphae on affected hair. Clipping of the affected hair is usually the most effective treatment modality, followed by application of topical antifungals or keratolytics.
What is black piedra hair?
Black piedra is a fungal infection of the hair shafts. It is also known as Trichomycosis nodosa. The fungal elements are attached to the hair shaft to form nodules along the hair shaft. It predominantly affects scalp hair, although involvement of the beard, mustache, and pubic hairs is also known.
Is white piedra the same as dandruff?
Dandruff vs. white piedra. Dandruff is a condition that affects the scalp, while white piedra affects the hair shaft.
What is Trichosporon Asahii?
Trichosporon asahii (formerly Trichosporon beigelii) is an emerging fungal pathogen seen particularly in immunologically compromised patients. There are now ~100 reported cases of hematogenously disseminated infections with this life-threatening yeast, and no effective antifungal therapy is available.
What kills black Piedra?
Black piedra is treated by using oral terbinafine. White piedra can be treated by using topical antifungals, including imidazoles, ciclopirox olamine, 2% selenium sulfide, 6% precipitated sulfur in petroleum, chlorhexidine solution, Castellani paint, zinc pyrithione, and amphotericin B lotion.
What causes Trichosporon Asahii?
asahii (formerly Trichosporon beigelii) infections have occurred in patients with leukemia, most of whom had neutropenia [5]. Other, less common predisposing factors include HIV infection, burns, organ transplantation, peritoneal dialysis, and iv catheters [6].
What causes Trichothiodystrophy?
What causes trichothiodystrophy? Trichothiodystrophy is caused by defective DNA repair and transcription and is inherited in an autosomal recessive pattern, meaning both parents must carry a copy of the mutated gene that causes trichothiodystrophy for a child to inherit the condition.
What does this photomicrograph reveal about Piedraia hortae?
Under a magnification of 475X, this photomicrograph reveals some of the ultrastructural morphology exhibited by the mycelium of the fungal organism, Piedraia hortae. P. hortae, is the causative agent for black piedra, a superficial fungal infection of the hair shaft.
Is Piedraia hortae a chlamydoconidia?
(Discuss) Proposed since September 2018. Piedraia hortae is a superficial fungus that exists in the soils of tropical and subtropical environments and affects both sexes of all ages. The fungus grows very slowly, forming dark hyphae, which contain chlamydoconidia cells and black colonies when grown on agar.
What does Piedraia hortae look like on agar?
When grown on agar at 25 °C (77 °F) Piedraia hortae grows very slowly to form black-greenish, limited and pointed colonies. Piedraia hortae taken from infected hairs have dark brown nodules, which are made up of ascostroma.
What causes Piedraia hortae nodules?
Piedraia hortae. Piedraia hortae is a dermatophyte and causes a superficial fungal infection known as black piedra, which causes the formation of black nodules on the hair shaft and leads to progressive weakening of the hair. The infection usually infects hairs on the scalp and beard, but other varieties tend to grow on pubic hairs.