Scabies disease is a highly contagious parasitic skin infestation, characterised by thin, slightly elevated, wavy grey–white burrows that contain the mites and eggs. Multiple papules and vesicles soon appear. The most common sites for burrows are between the fingers and toes, anterior surfaces of the wrists and elbows, axillae, lower abdomen, beneath breasts and genitalia. The face, head, palms and soles are seldom involved in adults. Nodular Scabies tend to appear sometime shortly after the initial scabies rash has been treated.  They can appear  a few weeks to even a few months after the infestation has cleared up. They are the result of allergic reactions to parts of the scabies mite that have been left under the skin from the original infection period.   

Lists of diseases and disorders, signs, symptoms