Which term relates to a skin condition in medical terminology?

The suffix "-derma" is specifically related to the skin in medical terminology. It is derived from Greek, where "derma" means skin. This suffix is commonly used in various medical terms that describe different skin conditions or the state of the skin itself. For instance, conditions like "pachyderma" (thickened skin) or "scleroderma" (hardening of the skin) illustrate its usage.

Other options are not related to skin conditions. The suffix "-dipsia" pertains to thirst and is often used in terms like "polydipsia," which refers to excessive thirst. "-dynia" relates to pain, as seen in the term "gastrodynia," which refers to stomach pain. Lastly, "-dysis" is used to refer to the process of separation or dissolution, as seen in "dialysis." Therefore, the correct term for a skin condition is "-derma" due to its direct association with skin-related terminology.