Final answer:
Vesicles, or small blisters, can be caused by various conditions including the skin infection impetigo, herpes simplex virus, contact dermatitis, and papillomas (warts). Impetigo is commonly caused by Staphylococcus aureus or Streptococcus pyogenes and leads to vesicles that can crust over. Herpes simplex virus causes cold sores or fever blisters, and genital herpes can cause painful blistering in the genital area.
Step-by-step explanation:
Several conditions can lead to the formation of vesicles, which are small, fluid-filled blisters on the skin. Impetigo, a common skin infection, often causes vesicles, pustules, or larger blisters called bullae around the mouth and nose. This contagious bacterial infection can be caused by Staphylococcus aureus, S. pyogenes, or a combination of both. In nonbullous impetigo, vesicles and pustules break open and crust over, frequently having a yellowish appearance. In its bullous form, large bullae fill with fluid, rupture, and produce draining, crusted wounds.Herpes simplex virus, particularly HSV-1, is another cause of vesicular lesions known as cold sores or fever blisters, which typically appear on the lips. Oral herpes can also affect other skin and mucous membrane areas. Genital herpes, usually caused by HSV-2, results in the development of painful infectious blisters in genital regions, occasionally recurring over time.Other causes of vesicles include contact dermatitis, which could be due to allergic reactions to substances like latex, and papillomas or warts caused by human papillomaviruses. Certain viral illnesses, such as roseola (HHV-6 and HHV-7) and fifth disease (parvovirus 19), manifest with skin rashes that may include vesicular components.