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Rare type of breast cancer without a lump: There is a less common form of breast cancer called inflammatory breast cancer. Its symptoms can be an inflammation of the breast tissue, such as with a breast rash with redness and warmth, but not necessarily a physical breast lump. This type of breast cancer should be considered as an uncommon possibility for certain types of breast symptoms. Psoriasis often undiagnosed cause of skin symptoms in children: Children who suffer from the skin disorder called psoriasis can often go undiagnosed. The main problem is that psoriasis is rare in children, and not often seen by physicians for this reason. children may receive treatment for fungal skin infections. See misdiagnosis of psoriasis or symptoms of psoriasis. Rare form of hair loss often misdiagnosed: a rare form of extreme hair loss called "Atrichia with papular lesions" (APL) is often misdiagnosed as alopecia totalis. Researchers estimate that about 1 per 100 diagnoses of alopecia totalis are incorrect. See introduction to alopecia totalis. Hair and scalp disorders misdiagnosed in African Americans: A higher than average percentage of misdiagnoses of hair or scalp disorders seem to occur in African Americans. Some of the overlooked hair/scalp conditions include cicatrial alopecia, traction folliculitis and sebhorrheic dermatitis. See hair disorders or scalp disorders.

Source: http://www.webmd.com