Name two glands present in the skin whose increased activity causes pimples and acne.

Explanation

**Step-by-Step Solution:**

1. **Identify the Skin Glands**: The question asks for two glands present in the skin that, when their activity increases, lead to pimples and acne.

2. **Understand the Role of Glands**: There are two main types of glands in the skin that are relevant to this question:
- **Sebaceous Glands**: These are oil glands that secrete sebum, which helps to keep the skin moisturized. An increase in their activity can lead to excess oil on the skin, contributing to pimples and acne.
- **Sweat Glands**: While primarily responsible for regulating body temperature and excreting waste, their activity can also influence skin conditions. However, the primary gland associated with acne is the sebaceous gland.

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