“Papulonodular” refers to the presence of papules and nodules; “dermatosis” (plural, “dermatoses”) is the medical term for any skin abnormality or disorder. “Papules” are small, solid, raised skin lesions of the skin that are less than 1 cm (approximately 0.5 inch) in diameter while “Nodules” are solid, raised masses of the skin that are more than 1 cm in diameter and that extend into the deeper layers of the skin
The skin disorders that are characterized by papules and nodules on the skin and that appear as solid bumps without pus or liquid within (nonsupperative) are called Papulonodular dermatoses.
Papules are the result of tissue infiltration by inflammatory cells. While nodules, which are larger than papules, are the result of a massive infiltration of inflammatory or cancerous cells into the layers of the skin.