- black piedra [DOID:12711]
A superficial mycosis that is a superficial fungal infection of the hair shaft caused by Piedraia hortae, an ascomycetous fungus forming hard black nodules on the shafts of the scalp, beard, moustache and pubic hair.
- Pthirus pubis infestation [DOID:13760]
A lice infestation that involves parasitic infestation by pubic lice Pthirus pubis, which are found in the pubic hair, less commonly in eyebrows, eyelashes, beard, mustache, armpit, perianal area, groin, trunk and scalp. The symptoms include itching in the pubic and groin area. Intense itching leads to scratching which can cause sores and secondary bacterial infection of the skin.
- selective IgM deficiency disease [DOID:0050222]
A selective immunoglobulin deficiency disease thatis a dysgammaglobulinemia resulting from decreased levels of immunoglobulin M (IgM) production to roduction of other antibodies.
- androgenic alopecia [DOID:0050801]
An alopecia that is characterized by M-shaped hair line recession and thinning of hair at the crown of the head in males.
- lymphoplasmacytic lymphoma [DOID:0060901]
A B-cell lymphoma characterized by the accumulation of monoclonal cells in the bone marrow and peripheral lymphoid tissues, and associated with the production of serum immunoglobulin M (IgM) monoclonal protein.
- CD40 ligand deficiency [DOID:0060022]
A combined T cell and B cell immunodeficiency that is a X-linked immunodeficiency with hyperimmunoglobulin M (XHIM) affecting isotype switching and is caused by the absence of CD40 ligand which is normally expressed on activated CD4+ T cells. Individuals with this mutation are unable to switch from IgM to IgG, IgA and IgE.