Tretinoin usage increases the sensitivity of the skin to UV rays. You should use a high-SPF moisturiser, like Purifide, when using Tretinoin.
There is no link between Tretinoin and hair loss. There is also no need to be concerned about using any hair products such as hairspray or gel as these are not directly applied to sensitive areas of the skin.
Using skin products that contain alcohol can make the skin more susceptible to side effects including stinging, burning and redness.