UNDERSTANDING YOUR SKIN
COMPOSITION OF THE SKIN
WHAT IS THE STRUCTURE OF SKIN?
The epidermis is divided into layers or strata
Where the keratinocytes are produced.
The keratinocytes are spindle shaped, and start producing keratin fibres.
The cells produce keratohyalin granules (the precursor of keratin) and these go into the extracellular matrix.
Clear layer or stratum lucidum
Cells have been flattened to confer a greater degree of structure.
This is the outermost layer, which contains many layers of dead cells that offer protection. These cells come loose, through a process called scaling. The sebaceous and sweat glands empty into this layer.
Subcutaneous tissue (hypodermis or subcutis)
The dermis or chorion
Aging (types of aging)
Hyperpigmented spots (hyperchromia)
Hypopigmented spots (Hypochromia)
Rosacea or couperosis
Each hair grows from a follicle and each follicle has its own cycle, which is independent from those surrounding it. That is why each hair on your head is in a different phase of its life cycle, at any given time. There are between 100,000 and 150,000 hairs on the head of a person without alopecia, of which 85%-90% are in the anagen phase or growth period, 1-2 % in the catagen or resting phase, while 13-14 % are in the telogen or fall phase.
Types of hair loss
Diffuse alopecia | Non-scarring alopecia
Alopecia areata | Non-scarring alopecia
Traumatic or drug-induced alopecia | Non-scarring alopecia
Androgenetic alopecia | Scarring alopecia
Infectious diseases: Fungal, bacterial.
Neoplastic diseases: Lymphomas, metastases, etc.
Dermatosis: Lichen planus, systemic lupus erythematosus, sarcoidosis, etc.