Final answer:
The 4 factors that can influence skin penetration are temperature, humidity, skin thickness, and the presence of occlusive dressings.
Step-by-step explanation:
The 4 factors that can influence skin penetration are:
- Temperature: Higher temperatures can increase the permeability of the skin, allowing substances to penetrate more easily.
- Humidity: High humidity can soften the skin, making it more permeable to substances.
- Skin thickness: Thinner skin allows for easier penetration.
- Presence of occlusive dressings: Occlusive dressings create a barrier on the skin's surface, preventing substances from penetrating.