goose bumps or goose flesh is  medically  known "cutis anserina"
. I want to take outdoor photographs of a model with goose bumps  for
at least 15 minutes (in a warm country)Besides using cold water,ice ,
a strong airconditioner or going to a very cold country, how can I
create goose bumps artificially.  A cream/lotion would be ideal. I
would like to know what I could use. Thankyou & good luck

A feather or similar instrument tickled down the spine normally works well.
Try the old school boy trick of running the first knickle of your
forefinger down their spind followed quickly by briefly putting your
thumb and forefinger either side of the neck muscles. This normally
cause goosebumps.

Goosebumps are a result of the erector muscles in the hair follicles
and they respond as a result of frieght or temperature.

The most obvious thing would be to remove your clothes and stand in
front of the refrigerator (or vertical freezer, if you have one). =)

Skin creams that contain Menthol or Tea Tree Oil often give a cool
feeling to the skin, which can cause goose bumps.