What triggers sebaceous glands to act? Also discuss the importance of sebum.

Explanation

### Step-by-Step Solution:

1. **Understanding Sebaceous Glands**:
- Sebaceous glands are small glands in the skin that produce an oily substance known as sebum.

2. **Triggers for Sebaceous Glands**:
- The primary trigger for sebaceous glands to become active is hormonal changes, particularly during puberty.
- Androgens, which are male hormones present in both males and females, stimulate these glands to produce more sebum.
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