Thin skin is usually more sensitive than thick skin. And finally, skin that has been abused in the sun can become sensitive over time. You want to avoid abrasive scrubs. Although exfoliation is vital to healthy skin, you don't want to cause more sensitivity by using a harsh scrub. Just imagine rubbing abrasive particles on sensitive skin.
Soap is another undesirable product.
People with sensitive skin want to be especially careful to use only nonalkaline products on their skin. Once again, avoid fragrance as an ingredient in your face products. Fragrance will almost always cause a reaction even on skins that aren't considered sensitive. Heat will further exacerbate sensitive skin. As with burns, you want to treat the skin gently, never using anything extreme.