I found several search results related to nail art, but none of them specifically mention "scary" nail art. However, I can provide some information on nail decals, nail polish ingredients, and gel nail polish.

Nail Decals:

• Etsy has several listings for nail decals with horror or Halloween themes.
• The decals are designed to be used on acrylic or press-on nails.
• The decals are made by WickedPixieCo and have many positive reviews and ratings.

Nail Polish Ingredients:

• Nail polish can contain harmful chemicals such as formaldehyde, toluene, and dibutyl phthalate (DBP) .
• Some nail polish brands are formulated without these harmful ingredients, such as Zoya, Kure Bazaar, Benecos, and Piggy Paint.
• Gel nail polish consists mostly of methacrylate compounds, photoinitiators, and plasticizers.
• ORLY is a brand that is formulated without harmful ingredients and does not contain the "toxic" trio of formaldehyde, toluene, and DBP.

Gel Nail Polish:

• Gel nail polish is easy to apply and can last for up to 21+ days with proper application.
• ORLY is a brand that offers gel nail polish that is formulated without harmful ingredients.
• Gel nail polish typically consists of methacrylate compounds, photoinitiators, and plasticizers.

Overall, while I could not find specific information on scary nail art, I hope this information on nail decals, nail polish ingredients, and gel nail polish is helpful.