1 It's the law! 2  All drugs have to be tested on animals before they can be tested on humans. 3  To make sure human patients are given a safe dose of a drug. 4  Patients feel safe and are more likely to trust medicines if they know they have been tested on animals first.erhaps the law could be changed so that animal testing was optional, rather than compulsory. Scientists could decide not to test drugs on animals if they knew that it was safe to do so. We would need alternatives to animal testing, which could safely test drugs without harmful consequences for humans.
1 Psoriasis is a common skin condition that can cause a scaly, itchy, red rash to form along the scalp, elbows, and joints.  Seborrheic eczema is a type of eczema that most often affects the scalp and causes redness, scaly patches, and dandruff. It can also occur on the ears, mouth, or nose.
Skin conditions that can cause itching include: 1  dry skin. 2  eczema â where the skin is dry, red, flaky and itchy. 3  contact dermatitis â inflammation of the skin that occurs when you come into contact with an irritant or allergen (see below).