Alopecia (chronic telogen effluvium): The term “telogen effluvium” was coined by Kligman in 1961. Is the acute loss of hair after chronic systemic diseases, emotional stress, febrile illness or childbirth. In the latter, telogen effluvium can last up to 6 months after full recovery.

Alopecia drugs: Vitamin A in large doses, cytostatic, thyroid, anticoagulated, mercury and valproic acid can produce alopecia. When the drug is stopped hair loss disappears.

Alopecia in systemic diseases: of endocrine, infectious, Lupus erythematosus or nutritional deficiency.

Alopecia hereditary syndromes:

The case of congenital atriquia the individio hairless. Also found in temporal triangular alopecia in the syndrome of hair loss in anagen, the hair hypoplasia and cartilage in Menkes syndrome in anhidrotic ectodermal dysplasia and tricorrinofalángico syndrome.

Cicatricial alopecia:

Unfortunately this type of alopecia because there is usually irreversible damage, malformation or complete rupture of the follicular structure. There is no treatment or drug that helps with hair follicles in an inert. If there are no damaged areas can be used to implant hair.
Scarring alopecia are classified as follows:

Alopecia infectious fungal (Kerion, candidiasis, favus), bacterial (syphilis, leprosy, acne necrotic) viral (herpes, varicella); protozoa (Leishmaniasis).

Alopecia physicochemical agents, caustic agents, mechanical trauma, burns and X-ray rediodermitis Consider that the follicles are sensitive to radiation.

Alopecia tumor: dermal tumors and metastases. Mast cells, basal cell or squamous cell carcinomas, lymphomas and adnexal tumors.

Alopecia and dermatosis: Graham-Little syndrome, dermatomyositis, sarcoidosis, follicular mucinosis.

Alopecia hereditary diseases: porokeratosis of Mibelli, epidermal nevus, Darier’s disease, ichthyosis and aplasia cutis.

Alopecia decalvans clinical syndromes: erosive pustular dermatosis, folliculitis decalvans, alopecia and pseudopelade parvimaculata.

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The fox lost his hair but not the tricks. In fact, it loses twice a year.

The word “alopecia” descends from the Greek word “Alopex” which means “fox.” The Royal Spanish Academy defines alopecia as “fall or pathological loss of hair.” Maybe it’s a short definition but it is more than right.

Alopecia is the fall prematurely or absence of hair in one or more parts of the body. Its causes are many and the types of alopecia are classified as follows:

Non-scarring alopecia:

They are very common and may improve or be cured through treatment and some even revert spontaneously without being treated. In this type of alopecia hair follicle has a pathological behavior but still alive unless alopecia extending over very long periods (common or androgenetic alopecia).

Can be classified as follows:

Androgenic alopecia, is also known as androgenetic alopecia or common baldness premature. It affects many men and women rarely.

If you suffer from androgenetic alopecia, as most men, I recommend having a look to the left and check on the Norwood Scale what type/grade of alopecia you have.

Will be very useful to know if any treatment can give results. If your level is very advanced (5, 6 or 7) will have to consider surgery or simply accept that you are bald. There are no treatments that have proven effective in less advanced degrees.

Androgens are the hormones responsible for hair loss and that is why many of the current treatments inhibit the production of them.

If baldness continues to advance and hair follicles die, the process becomes irreversible and no treatment to restore the situation. Can only be repaired by transplanting living follicles from other areas to the crown and tickets, a Hair transplant. Ideally, of course, is to fight the fall while the follicles are alive.

Women are more fortunate than the man as androgenetic alopecia appears only in the front of the scalp, leaving hair more sparse but on rare occasions it can be completely depopulated areas and in man.

Alopecia areata:

The cause is unknown but the symptoms are clear: head round patches of hair completely deserted. Alopecia totalis (AT) is when you completely lose scalp hair. In cases of Alopecia universalis (AU) is losing hair around the body.

There are still no fully effective treatments for this type of alopecia. Therapies that are used with medium results are: ultraviolet light, topical corticosteroids, steroid injections or to excite irritants follicle stimulating hair growth.

Source: www.recuperarelpelo.com/informacion-caida-cabello/tipos-de-alopecia.html
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As we know, alopecia is the scientific term used to describe the hair loss. Different types of alopecia, which stem from different causes and are expressed differently in the person who suffers in this article we will see the two most common types of alopecia.

Types of Alopecia, Androgenetic Alopecia

Androgenetic alopecia or hair loss male pattern has a genetic cause and affects 60% of men over 50 years. It is the most widespread type of baldness among males and their appearance is induced by male sex hormones begin to be produced by the body of the male at puberty. Androgenetic alopecia is present in 20% of young males between 18 and 25.

Although all male hormones, the fact that some developing androgenetic alopecia and others do not essentially dependent on genetic conditioning. Another factor such as stress can also accelerate hair loss in some men.

Experts insist that hair loss in men is not an irreversible process can be stopped. A dermatologist is the most qualified professional to address the problems of alopecia.

Types of Alopecia, Alopecia Areata

A type of alopecia of unknown origin, although they suggest autoimmune diseases as possible causes of hair loss. Alopecia areata usually presents as patches on the scalp, but may also spread to other body areas. Can occur at any age and affects both sexes equally. Is estimated to affect one in every thousand people.

In some cases, alopecia areata can progress to total hair loss. Hair follicles are not destroyed by this disease, so that hair can grow back, although there are frequent recurrences in patients who have ever experienced.

Stress can be a cause of alopecia. The same goes for food, general health, hormonal imbalances, among others. If hair loss is so significant as to be concerned, then you should consult with a doctor to determine its causes.

Any type of hair loss is called alopecia, but there are many types of alopecia and its causes are multiple. Only a doctor can diagnose stress alopecia and give appropriate treatment. There are many possible treatments for combat stress alopecia.

If this is a clinical problem, shampoos will not do any good. Shampoos can be used in cases of hair loss caused by skin irritations and clogged pores and follicles, but do not give a solution in cases of medical problems related to hair loss.

If this is not the problem, if it is alopecia areata, it will get worse. With a little luck, a problem will be easier, perhaps caused by a hormonal imbalance, or due to an “agent” unknown that affects the scalp. In such cases, the doctor we usually prescribe a treatment to fix the problem and the hair will grow back normally.