The distribution of heterochromic hair can be symmetric or asymmetric. There are various etiologies of scalp hair heterochromia, which includes genetic basis, metabolic defects, nutritional defects, or drugs. ![]() The author also speculates that hair follicles individually may have remarkable autonomy in terms of their pigment type, which may be the cause of variable polymorphisms in hair pigmentation. Whereas, melanosomes in blond hair are weakly melanized. Black hair follicle melanocytes have the largest number of eumelanosomes (melanosomes containing eumelanin) and red hair follicle melanocytes contain pheomelanosomes. Melanosome structure correlates with the type of melanin produced. The skin phototype does not determine the hair color as can be seen by the co-expression of eumelanic hair color in the Fitzpatrick skin type 1 and 2. Tyrosinase activity determines the color of individual hair. Another pathway leads to the formation of benzothiazinyl alanine which forms pheomelanin and trichochromes. Dopaquinone converts to 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid oligomers to form eumelanin. Melanin pathway divides into two pathways after the formation of dopaquinone from tyrosine. The process of melanogenesis is controlled by complex genetic mechanisms. Based on these findings, diagnosis of patchy heterochromia of the scalp hair was made.įollicular melanogenesis of hairs is tightly coupled with hair growth cycle, i.e., melanocytic proliferation (during early anagen), maturation (mid-to-late anagen), and melanocytic death via apoptosis (during early catagen). As the pigmentation was homogenous throughout the hair shaft, the diagnosis of segmental heterochromia was excluded. On light microscopy, the lighter hair appears to be slightly thinner than the darker hair and the pigmentation was homogenous along the entire hair shaft. Routine blood investigations were normal. No ophthalmologic, audiologic, or neurological abnormalities were found. Nails, teeth, and oral mucosa were normal. The hair of the eyelashes and eyebrows were of black color. As the underlying skin of blond hairs was normal, the diagnosis of melanocytic nevi, halo nevus, and vitiligo was excluded. On cutaneous examination, the patient had tuft of blond hair on the bilateral parietal region of the scalp following Blaschko's lines with normal color of the underlying skin. General physical examination revealed normal physical development. So, if this has made you eager to dye your hair red, continue reading to learn about all the different ways you can dye your hair red and be obsessed with your new hair color!ĭisclaimer: The tutorials below show you how red hair color is done, but unless you are very experienced at dyeing your hair at home, you should always have your color done at a salon.Tuft of blond hairs on the right and left parietal region with black hairs on the rest of the scalp in a 2-year-old male child And they work on any length of hair, as you’ll see below. So, if you are considering dyeing your hair red, but don’t want to go for a super bright red, no worries - there are so many red hair colors to choose from. Now that I have seen so many people dyeing their hair red, I am obsessed! Red hair looks amazing and there are so many different shades that I had never considered. I am absolutely loving this trend because I have always wanted to try out red hair, but have doubted whether it would actually look good on me. Hair color makes up a large part of our appearance, so it is a great way to make yourself stand out, especially if you dye your hair a different color.Įven though dyeing your hair a different color can seem scary, it’s the best way to switch up your appearance if you are looking for a change.Īre you considering changing your hair color? If so, I recommend going red! Red hair seems to be the new favorite hair color this year, and every celebrity you can think of has been coloring their hair red.
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