To determine whether a skin lesion is a sunspot (solar lentigo) or hyperpigmentation, it is important to consider several factors, including your age, sun exposure history, and any topical treatments you use. 1. **Age**: While sunspots are more common in older adults due to cumulative sun exposure, they can appear in younger individuals, especially those who have significant sun exposure or a history of tanning. 2. **Appearance**: Sunspots typically appear as flat, brown, or black spots on areas frequently exposed to the sun, such as the face, hands, shoulders, and arms. Hyperpigmentation, on the other hand, can result from various causes including inflammation, hormonal changes, or injury to the skin, and it may appear as patches of darker skin. 3. **Rogaine (Minoxidil)**: Minoxidil is primarily used for hair growth and is not commonly associated with hyperpigmentation. However, some people may experience skin irritation or contact dermatitis, which can potentially lead to secondary hyperpigmentation if the skin becomes inflamed. Given your age and the use of Rogaine on your eyebrows, it's less likely but not impossible for the lesion to be a sunspot. It’s more likely to be a form of hyperpigmentation, especially if you have a history of skin irritation or inflammation in that area. **Recommendations**: - **Consult a Dermatologist**: For an accurate diagnosis, it's best to see a dermatologist. They can examine the lesion and may use tools like a dermatoscope for a closer look. - **Sun Protection**: Regardless of the cause, using a broad-spectrum sunscreen daily can help prevent further pigmentation issues and protect your skin from harmful UV rays. - **Monitor Changes**: Keep an eye on the lesion for any changes in size, shape, or color, and report these to your healthcare provider. If you experience irritation from Rogaine, consider discussing alternative treatments with your dermatologist. They can provide guidance on how to manage your eyebrow treatment without exacerbating skin issues.