Seborrheic dermatitis? or rosacea?

I went to the dermatologist recently and he diagnosed me with seborrheic dermatitis. However, I am not sure that is correct. My nose is kinda reddish/pinkish, but it does not itch (a big symptom of it). i do have oily skin, but i think is rosacea. My nose is a bit flaky, but i think it is because my skin does not absorb the lotion i put on it and it peels off. if i didnt put any lotion on it, no flaking would occur. he gave me oxistat to use, but i am wary of putting steroid on my nose.