Phoma is a common fungus found in plant material and soil. It is also frequently found indoors on walls, ceiling tiles, and the back side of linoleum. Phoma has also been found growing on cement, paper, wool, paint, wood, and foods such as rice and butter.

It is visible as pink and purple spots on painted walls, but the spores are colourless.

Symptoms of exposure to Phoma include respiratory symptoms, skin rash, shortness of breath, blocked nose, and itchy throat. It has also been reported to cause a rare skin infection. It is allergenic causing Type I and Type III allergies.