Psoriasis is known to be a chronic type of skin disease. What this does is it will make the skin cells grow so quickly that the skin will have the tendency to stay there for an extended period of time. This can make different patches of skin appear on different parts of the body including the scalp. When you say seborrheic dermatitis, this can look similar to psoriasis because it will also have the tendency to make some portions of the skin look scaly. This may also appear on some parts of the face and also the scalp. One main difference is that you will notice that the patches of psoriasis will have the tendency to look drier. If you would look at your scalp when you have psoriasis, you will notice that it will normally extend beyond your hairline.
Some may become a bit confused with the different skin conditions that they may have. Two of the common skin conditions that people may have is psoriasis and dermatitis. Psoriasis is known to be a chronic skin disease. This tends to make the cells of the skin grow quickly so they will have the tendency to accumulate on the skin.
The rough and scaly skin can appear on various parts of the body. Dermatitis is also a condition that can cause the skin to have rough and scaly patches, but it may only appear from time to time. Usually, if there is a trigger that made the condition occur. The best thing that you can do when you are not sure what you have is to get your skin checked immediately.