What is the primary purpose of a skin biopsy?

The primary purpose of a skin biopsy is to diagnose skin diseases or conditions. This medical procedure involves removing a small sample of skin tissue, which is then examined under a microscope by a pathologist. By analyzing the cellular structure and any abnormalities present in the tissue, healthcare providers can identify various skin disorders such as infections, skin cancers, autoimmune diseases, or inflammatory skin conditions.

The other options, while related to skin health, do not encompass the main goal of a skin biopsy. Removing moles for cosmetic reasons is typically a surgical procedure, not a biopsy, as it often does not involve pathological examination unless there are concerning features. Evaluating blood circulation in the skin involves different diagnostic techniques, such as Doppler ultrasound or other imaging methods rather than a biopsy. Assessing the skin's moisture level is usually done through non-invasive means or clinical assessments rather than through the invasive nature of a biopsy. Thus, the focus and intended outcome of a skin biopsy is firmly centered on diagnosis rather than cosmetic or functional evaluations.