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Contact allergy to fragrances usually causes dermatitis of the hands, face, and or armpits 16-18 , the latter site being explained by contact allergy to deodorants and fragranced antiperspirants. In the face, the skin behind the ears and neck is exposed to high concentrations of fragrances in perfumes and aftershaves. Microtraumata from shaving facilitates (photo)contact allergy to aftershave fragrances. The sensitive skin of the eyelids is particularly susceptible to developing allergic contact dermatitis to fragrances in skincare products, decorative cosmetics, and cleansing preparations, as well as from fragrances spread through the air (airborne contact dermatitis) 19 . Most reactions are mild and are characterized by erythema (redness) only with some swelling of the eyelids. More acute lesions with papules, vesicles, and oozing may sometimes be observed. Dermatitis attributable to perfumes or toilet water tends to be ''streaky.'' In some cases, the eruption resembles other skin...
The human skin is densely populated with resident microbiota, composed of commensal microorganisms such as S. epidermidis, P. acnes, Micrococcus luteus and or Malassezia furfur. These microorganisms compete for nutrients and space, limiting each other's population size and also competing out pathogens that may attempt to colonize the skin. Despite the density of the microbiota, epidermal keratinocytes do not activate pro-inflammatory signaling cascades in response to commensal microorganisms, suggesting a complex host-microbe relationship in the epidermis. Thus, epidermal keratinocytes may need to discriminate the presence of commensals from the presence of pathogens, by mechanism s that are not yet fully identified One possible explanation for the un-responsiveness of the skin to resident microbiota is the anatomical localization of the TLR-ex-pressing keratinocytes. Since TLRs are expressed by the basal keratinocytes, the layer that is normally not exposed to commensal...
Some sengi species also sand-bathe, wallowing in dry sand, a behavior noted in other rodent species. Sand-bathing both scent-marks the immediate territory and serves to clean the fur of accumulated oil, dandruff, and dirt. Established sand-bathing spots are scattered throughout a sengi trail system. Soft-furred sengis also clean their fur with their tongues and scratch with their hind legs, able thereby to reach all parts of their bodies.
Thickeners comprise a broad variety of compounds that are used to increase viscosity of the formulations, modifying their consistency from viscous liquids to thick gels. Among the most frequently used are electrolytes, such as sodium chloride, alkanolamides and water-soluble cellulose derivatives, such as carboxymethylcellulose, hydroxyethylcellu-lose, carboxy vinyl polymers of the Carbopol type, polyvinyl alcohols, and natural gums, such as tragacanth. Magnesium aluminum silicates have found application as thickeners and suspending agents in antidandruff shampoos.