A client with oily, waxy scales has _______________

The condition described, characterized by oily, waxy scales, is typically associated with pityriasis steatoides. This condition is often marked by excessive oiliness and is a form of severe dandruff where the scalp produces an overabundance of oil, leading to the formation of thick, greasy scales. These scales can be more prominent in the scalp area and may also appear on other parts of the body if the condition is extensive.

While dandruff involves scaling, it usually does not present with the thick, oily consistency seen in pityriasis steatoides. Psoriasis, on the other hand, is characterized by red patches of skin covered with thick, silvery scales but is often dry rather than oily. Eczema is more of a skin inflammation that can cause red, itchy patches but does not typically feature oily scales either. Thus, the specific nature of the oily, waxy scales aligns with pityriasis steatoides, making it the most accurate choice in this context.