In regards to obtaining information on Nanoparticles "Silica" toxicity in humans, you can go to the following websites:
1 CDC National Institute for Occupational Safety and Health:
2 Journal of bionanotechnology: http://www.jnanobiotechnology.com/content/2/1/12
You will find information in regards to toxicity and diseases caused by nanoparticles Silica which are published by 116 scientists, investigators and researchers references. Most of which are in the CDC home page.
I'm sure after reviewing the publications of 116 investigators you will realize that morgellons is a disease and not a hallucination. For further information read the following:
showing unusual skin and hair diseases which I call Karjoo's Phenomenon "Morgellons", caused by nanoparticle Silica.
Rahim Karjoo MD, Inc.
It's about time that Morgellons victims were informed of the cause of Morgellons disease. Since 1994, I have known of symptoms similar to those attributed to Morgellons, including skins lesions, abnormal hair, sensations, anxiety, GI, oral, and joint problems. I saw these same symptoms when I conducted research on thousands of silicon implant cases. I reviewed both clinical findings and microscopic examinations of the breast capsule as well as breast tissue around the implants, lymph nodes, kidney, intestinal mucosa and other tissues. My findings mirrored those found in many Morgellons cases that I had reviewed. Indeed, as many as 10% of confirmed Morgellons cases involved patients with breast implants. Four of the patients I reviewed ended up having their implants removed. Microscopic examination of the implant shows silicon dioxide (silica), both in the breast tissue as well as their skin samples. These cases showed more skin lesions than in cases of people who did not have silicon in their breast implants. Those people who do not have silicon implants but still exhibit symptoms of Morgellons disease are the victims of exogenous sources of silica found in thousands of products such as various food products, computer chips and hundreds of other items that were found containing silicon silica. Many people suffering from this disease have committed suicide. It's time for the world to wake up and take this illness seriously.
Skin is an important barrier, protecting against insult from the environment. The skin is structured in three layers: the epidermis, the dermis and the subcutaneous layer. The outer layer of the epidermis, the stratum corneum (SC), covers the entire outside of the body and only contains dead cells, which are strongly keratinized. For most chemicals the SC is the rate- limiting barrier to percutaneous absorption (penetration). The skin of most mammalian species is, on most parts of the body, covered with hair. At the sites, where hair follicles grow, the barrier capacity of the skin differs slightly from the "normal" stratified squamous epidermis. Most studies concerning penetration of materials into the skin have focused on materials as a vehicle. The main types of particulate materials commonly used are; liposomes; solid poorly soluble material such as TiO2 and polymer particulates and submicron emulsion particles such as solid lipid nanoparticles. The penetration of these particulate carriers has not been studied in detail.
TiO2 particles are often used in sunscreens to absorb UV light and therefore to protect skin against sunburn or genetic damage. It has been reported by Lademann et al in  that micrometer-sized particles of TiO2 get through the human stratum corneum and even into some hair follicles — including their deeper parts. However, the authors did not interpret this observation as penetration into living layers of the skin, since this part of the follicular channel (the acroinfundibulum) is covered with a horny layer barrier too . A different interpretation has been suggested in a recent review by Kreilgaard , who argued that "very small titanium dioxide particles (e.g. 5-20 nm) penetrate into the skin and can interact with the immune system". Tinkle et al  demonstrated that 0.5 — and 1.0 micron particles, in conjunction with motion, penetrate the lipid layers within the cells of the stratum corneum form a pathway by which the particles can move  into the skin and be phagocytized by the Langerhans cells. In this study the penetration of particles is limited to particle diameter of 1 micron or less.
Nevertheless, other studies reported penetration through the skin using particles with diameters of 3-8 micron [86,87,82] but only limited penetration was found often clustered at the hair follicle (see above).
Penetration of non-metallic solid materials such as biodegradable poly (D,L-latic-co-glycolic acid (PLGA) microparticles, 1 to 10 micron with a mean diameter of 4.61 ± 0.8 micron was studied after application on to porcine skin. The number of microparticles in the skin decreased with the depth (measured from the airside towards the subcutaneous layer). At 120 micron depth (where viable dermis present) a relatively high number of particles was found, at 400 micron (dermis) some micro-particles were still seen. At a depth of 500 micron no microparticles were found . In the skin of individuals, who had an impaired lymphatic drainage of the lower legs, soil microparticles, frequently 0.4 - 0.5 micron but as larger particles of 25 micron diameter, were found in the dermis of the foot in a patient with endemic elephantiasis. The particles are seen to be in the phagosomes of macrophages or in the cytoplasm of other cells. The failure to conduct lymph to the node produces a permanent deposit of silica in the dermal tissues (a parallel is drawn with similar deposits in the lung in pneumoconosis). This indicates that soil particles penetrate through (damaged) skin, most probably in every individual, and normally are removed via the lymphatic system [89, 90]. Liposomes penetrate the skin in a size dependent manner. Micro-sized, and even submicron sized, liposomes do not easily penetrate into the viable epidermis, while liposomes with an average diameter of 272 nm can reach into the viable epidermis and some are found in the dermis. Smaller sized liposomes of 116 and 71 nm were found in higher concentration in the dermis.