Internal Factors
The influence of internal factors on skin condition is as crucial as the influence of the external ones. It has been proved that the cause of skin diseases and some of its ailments are due to general body disorders and many internal organs diseases. Human skin is as if the photograph of the whole organism. As for the examples: disorders of digestive track (constipation, etc.) are shown by itching, nettle rash and those disorders deepen seborrhoeic state of common acne and acne rosacea; diabetes for instance changes chemical reactions taking place in skin tissues causing dehydration so that the skin is prone to purulent infections such as inflammation of follicle or itching of the skin. Some liver dysfunctions are visible in medicinal rush.
The colour of the skin also displays some disorders of interior organs and signal diseases such as: circulatory insufficiency (this can be seen as cyanosis), Addison's disease (brownish tint), etc. Skin hyperpigmentation (in the form of blotch) is sometimes caused by physical condition or state of the whole body, for example in pregnancy state. Additionally, the endocrine system plays an unquestionable role in skin's appearance. The seborrhoea is strictly connected with sexual glands activity, thyroid.