What is a potential side effect of pro-hormones regarding skin condition?

The correct answer is acne, which is a well-known potential side effect associated with pro-hormones. Pro-hormones can lead to hormonal imbalances that increase oil production in the skin, resulting in clogged pores and an outbreak of acne. This reaction is particularly prevalent among individuals who have a predisposition to acne and is often exacerbated by the hormonal fluctuations caused by these substances.

Rashes, eczema, and psoriasis typically arise from different causes and mechanisms unrelated to the hormonal effects that pro-hormones exert. While various reactions are possible from different substances, acne is distinctly tied to the effects of pro-hormones on hormonal levels and the body's sebaceous glands. This connection clarifies why acne is the most relevant side effect in the context of pro-hormonal use and skin conditions.