Saboreic dermatitis/saboriasis. True?.

From 1 year iam using ciplar-la 20 mg(propanolol beta blockers) for high heart beat. So from 6 months I have  black mark on both sides of nose,upper nose ,chin, some times it is very burning and falls scales (dandraff )on these areas these areas are very red in colour.dermatologist prescribed emunosome m cream I apply this cream these marks decreases after stopped comes again,doctor gave telumus 1%cream(1time on night)moisturizer also applying but no use.still it is in same way I conuslt again, doctor told for using beta blockers it secrets of high sebum it it true?.this patches like sabosoriosis.please tell me sabboreic dermatitis and sabosoriosis are same,psoriasis is different from sabosotiasis.I. have no dandruff on scalp but some times only itching on behind the ear and scalp.