Detailed answer

Hyperpigmentation is caused primarily by an increase in melanin production in the skin, which is triggered by factors such as sun exposure, hormonal changes, and skin injuries. Constant exposure to pet dander or animal allergens does not directly affect the melanin production process, therefore it does not worsen hyperpigmentation. However, if an individual with hyperpigmentation also has allergies to pet dander or animal allergens, the excessive scratching or rubbing of the skin due to allergic reactions may increase the risk of developing further skin damage or inflammation, which could potentially lead to post-inflammatory hyperpigmentation. It is important for individuals with hyperpigmentation and allergies to manage their allergies properly and avoid excessive skin irritation or injury to prevent any potential worsening of their condition.