No, topical tretinoin is not a steroid. Side effects like dryness, redness, itching and burning can occur (not always occur) and usually do so if used outside the advice of the dermatologist.  And  since you are using the cream as recommended by the dermatologist you needn't worry since you can always go back and speak with your dermatologist IF AT ALL the side effects occur. Excessive application of cream or massaging if not done, also reduce the chances of side effects.