In the blanching test, placebo, basis and active topical steroid should always be used together and at the experimental sites randomized. The semi-quantitative measure (ordinal scale) of the effects induced by topical steroid does not seem to be more accurate than the qualitative measure (nominal scale). In an attempt to introduce an objective measurement of the blanching effect based on the temperature variation, no correlation has been found between cutaneous temperature and blanching effect. However, some thermal constants have been established on the forearm which is often used in experimental dermatology.