Describe the disease of erythematous

Erythema nodosum is characterized by tender, red bumps, usually found symmetrically on the shins. Up to 55 percent of cases have no clear identifiable cause. Sometimes, erythema nodosum is not a separate disease. Rather, it is a sign of some other infection, disease, or of a sensitivity to a drug.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

i think the answer is a.keratin is the pigment responsible for skin color.