Which of these organisms is the usual causative agent of white piedra?

Which of these organisms is the usual causative agent of white piedra?

Cladosporium cladosporioides may also cause white piedra. In Brazil Trichosporon ovoides and Trichosporon inkin are common causative agents of white piedra, producing nodules in genital hair or on the scalp.

What causes white piedra?

White piedra is a fungal hair shaft infection caused by fungi from the Trichosporon genus class Basidiomycetes. This condition was previously thought to be caused by Trichosporon beigelii (now called Trichosporon cutaneum).

What is the difference between black piedra and white piedra?

The two types of piedra, white piedra and black piedra are caused by fungi of the genera Trichosporon and Piedraia respectively. [1,2] Typically, black piedra affects the scalp hair, while white piedra tends to affect facial, axillary and pubic hair.

Which species of Trichosporon causes scalp hair white Piedra?

White piedra is a superficial fungal infection of the hair shaft, caused by Trichosporon beigelii. It is also known as tinea nodosa, trichosporonosis nodosa, and trichomycosis nodularis.

What causes dermatophytes?

Dermatophytes are fungi that require keratin for growth. These fungi can cause superficial infections of the skin, hair, and nails. Dermatophytes are spread by direct contact from other people (anthropophilic organisms), animals (zoophilic organisms), and soil (geophilic organisms), as well as indirectly from fomites.

What causes Monilethrix?

Monilethrix is caused by mutations in one of several genes. Mutations in the KRT81 gene, the KRT83 gene, the KRT86 gene, or the DSG4 gene account for most cases of monilethrix. These genes provide instructions for making proteins that give structure and strength to strands of hair.

What is Trichosporon Asahii?

Trichosporon asahii is an opportunistic fungus that causes infections in immunosuppressed patients. Neutropenia developing due to malignancies is an important risk factor for fungal infection.

What is the clinical features of black Piedra?

Clinical features Black piedra is characterized by darkly pigmented nodules in the hair shaft that vary in size (up to a few millimeters in diameter). The lesions produce a metallic sound when brushing the hair. The nodules are hard and firmly attached to the scalp hair, especially the frontal area.

What is trichosporon Asahii?

What is Trichorrhexis?

Trichorrhexis nodosa is a common hair problem in which thickened or weak points (nodes) along the hair shaft cause your hair to break off easily.

What is black piedra and what causes it?

Black piedra is a fungal infection of the hair shafts of humans and animals caused by Piedraia hortae.

What is black piedra (tinea nodosa)?

Black piedra also known as trichomycosis nodosa, tinea nodosa or trichosporosis, is Piedraia hortae fungus infection of the hair shafts resulting in the formation of small black nodules 1). The fungal elements are attached to the hair shaft to form nodules along the hair shaft.

What are the possible complications of black piedra infection?

There are no serious complications of black piedra infection. In the absence of treatment, patients with comorbidities (diabetes, immunodeficiency, and malignant tumors) may develop alopecia.

How is black piedra distinguished from pediculosis and tinea capitis?

Black piedra can be distinguished from pediculosis, white piedra (caused by Trichosporon species), tinea capitis and other similar conditions by examining individual hairs in a KOH preparation using light microscopy.